Patent US3713860A successfully refreshed from Google Patents.
US3713860A
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Bone substitute
Assignee: United States Atomic Energy Commission
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Filing: 1970-08-31
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Granted: 1973-01-30
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Expires: 1990-08-31
Abstract
Abstract A bone substitute and a method for preparing the bone substitute in which porous aluminum oxide is initially impregnated with pure methyl methacrylate monomer. The monomer is polymerized by gamma irradiation and polymer is then removed by solution from selected areas where muscle and bone attachment is to be made in situ. Further irradiation sterilizes the bone substitute.
Inventors
- 👤 A Auskern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:05
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/40; A61L27/44; A61L27/446; C; C09; C09D; C09D4/00; Y; Y10; Y10S; Y10S623/00; Y10S623/92; Y10S623/923
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
The method of preparing an article of manufacture comprising steps of: a. forming a porous ceramic body of substantially pure aluminum oxide; b. impregnating said body with methacrylate monomer free of catalyst and additives; c. subjecting the impregated body to gamma radiation for a time sufficient to polymerize said monomer followed by machining of said article to proper size and shape; and d. dissolving polymer from selected areas of said body to a minimum depth of 100 microns to obtain exposed porous surface regions in said body.
Claim 2
Independent Claim
87 words
The method of preparing an article of manufacture comprising steps of: a. forming a porous ceramic body of substantially pure aluminum oxide; b. impregnating said body with methacrylate monomer free of catalyst and additives; c. subjecting the impregated body to gamma radiation for a time sufficient to polymerize said monomer followed by machining of said article to proper size and shape; and d. dissolving polymer from selected areas of said body to a minimum depth of 100 microns to obtain exposed porous surface regions in said body.
Claim 3
Dependent Claim
23 words
The method of claim 1 in which Said body is exposed again to radiation of sufficient duration and intensity to cause sterilization thereof.
Claim 4
Dependent Claim
21 words
The method of claim 2 in which said body has a pore size in the range of 75 to 150 microns.
Claim 5
Dependent Claim
19 words
The method of claim 2 in which said body has a porosity of 30 - 50 percent by volume.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |